Iterative Interference Suppression Using Mixed Feedback Weights and Stabilizing Step Sizes
AssigneeRambus Inc.
InventorsTommy Guess, Michael L. McCloud, Vijay Nagarajan, Gagandeep Singh Lamba
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Abstract
A receiver is configured for canceling intra-cell and inter-cell interference in coded, multiple-access, spread-spectrum transmissions that propagate through frequency-selective communication channels. The receiver employs iterative symbol-estimate weighting, subtractive cancellation with a stabilizing step-size, and mixed-decision symbol estimate. Receiver embodiments may be implemented explicitly in software of programmed hardware, or implicitly in standard Rake-based hardware either within the Rake (i.e., at the finger level) or outside the Rake (i.e., at the user of subchannel symbol level).
Claims23
An interference suppressor configured for computing interference-suppressed symbol estimates and performing processing during each of at least one iteration, the suppressor comprising
- a processor configured for
- calculating a stabilizing step size having a magnitude that is a function of at least a received signal;
- and
- weighting an error signal with the stabilizing step size.
An interference suppression method comprising:
- configuring a processor for
- computing interference-suppressed symbol estimates;
- and
- applying stabilizing step sizes to an error signal during each of at least one iteration;
- wherein applying stabilizing step sizes comprises calculating a stabilizing step size having a magnitude that is a function of at least a received signal.
Dependencies are inferred from the claim text.